The truth is I don't know how the MU allowed itself to be fooled by ETH at that time, however as I said before, for me he was the destroyer of the MU, and he caused so much damage that the team still hasn't been able to lift its head up, it's difficult to lift a team when it's like this, however for me Amorim has done what he could, what I didn't like was his treatment of Garnacho, it's not the way he did it, but those are very internal problems.
Before Erik Ten Hag, they put belief wrongly in Solskajer and Pogba while they were very disrespectful with Jose Mourinho who in my opinion is a best coach for Manchester United about 20 years after Sir Alex Ferguson's retirement. They did many inaccurately at internal scale and later made many bad player transfers and salary deals in signed contracts. They have wasted a lot of money by bad strategies and management over recent years.
Ruben Amorim was given an opportunity to upgrade their coach career while it is also biggest challenge for him so far. Manchester United only can change to be better firstly by strategic changes on transfer market like PSG began three years ago and won UEFA Champions League last season.